FUZZY PWM CONTROL OF THE POSITIONS OF A PNEUMATIC ROBOT CYLINDER USING HIGH-SPEED SOLENOID VALVE

In the study, instead of using expensive servo valves, three inexpensi ve high-speed solenoid valves were adopted and a fuzzy PWM controller was designed to control the linear and rotational positions of a pneum atic robot cylinder. The modified differential PWM method is proposed to eliminate the dead zone and to improve the nonlinear characteristic s between the pressure difference of the cylinder and the duty ratio o f the PWM control signal. The experimental results have shown that the servo pneumatic system with the proposed fuzzy PWM controller exhibit s good performance.